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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 22, Iss. 2 — Feb. 1, 2005
  • pp: 315–322

Triplet–triplet annihilation in viscous solutions as an example of non-Fickian diffusion

Pawel Borowicz and Bernhard Nickel  »View Author Affiliations


JOSA B, Vol. 22, Issue 2, pp. 315-322 (2005)
http://dx.doi.org/10.1364/JOSAB.22.000315


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Abstract

Diffusion-controlled triplet–triplet annihilation is analyzed in terms of non-Fickian diffusion. The description is based on the second Fick’s law with a time-dependent diffusion coefficient. We introduce the time-dependent diffusion coefficient because of the interaction of two associated relaxation phenomena: first-order decay and diffusion-controlled annihilation. The equation for the time-dependent rate parameter k2A(t) obtained from the model proposed is compared with the standard Smoluchowski expression. The new equation is applied for the evaluation of the kinetic data of the diffusion-controlled triplet–triplet annihilation of anthracene. The limits of the applicability of the proposed model are discussed.

© 2005 Optical Society of America

OCIS Codes
(260.0260) Physical optics : Physical optics
(260.2160) Physical optics : Energy transfer
(300.0300) Spectroscopy : Spectroscopy
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6550) Spectroscopy : Spectroscopy, visible

Citation
Pawel Borowicz and Bernhard Nickel, "Triplet-triplet annihilation in viscous solutions as an example of non-Fickian diffusion," J. Opt. Soc. Am. B 22, 315-322 (2005)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-22-2-315


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